Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Amortized Cost	$ 1,129,057	$ 838,994
Allowance for credit losses	(167)	0
Time deposits 100,000 or more	$ 100	$ 100
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	100,000,000	100,000,000
Common stock, issued (in shares)	31,779,663	33,241,496
Common stock, outstanding (in shares)	31,779,663	33,241,496